1.0 General Specifications
There shall be furnished one (1) one only Grind Hog™ Model 16ASX T/S Comminutor as manufactured by G.E.T. Industries Inc. Rotation shall be in a clockwise direction.
1.1 Design Criteria
The comminutor shall be designed to handle the flows indicated below, within the head loss noted.
- a) hydraulic capacity 3.5 MGD (13,200m3/day)
- b) satisfactory operation shall occur under conditions of zero flow
- c) head loss at peak flow shall not exceed 20 inches (508 mm)
- d) design shall be such that the flow enters the size reduction and screening device horizontally and exits vertically downward to facilitate the flushing of solids
1.2 Cover Plate
Shall be:
- a) of heavy-duty construction and of high quality cast iron
- b) fitted with 4 position lock down arrangement, and 2 alignment holes for repositioning following service
- c) located on, and positioned by wall mounted supports allowing for ease of removal for inspection and maintenance
1.3 Rotating Drum Screen
- a) heavy-duty Cast Ductile Iron ASTM 536, grade 60-45-18
- b) stationary cutting bar shall be of high-quality 01 tool steel hardened to a minimum of 56 Rockwell C, and shall be reversible, allowing for four (4) sets of cutting edges prior to sharpening or replacement
- c) all submerged fasteners shall be of stainless steel
1.4 Cutting Elements
- a) replaceable shear bars constructed of high-quality A2 tool-steel shall be attached to the rotating drum. Each shear bar shall be machined from solid bar stock, surface ground to establish exact tolerances
- b) stationary cutting bar shall be of high-quality 01 tool steel hardened to a minimum of 56 Rockwell C, and shall be reversible, allowing for four (4) sets of cutting edges prior to sharpening or replacement
- c) all submerged fasteners shall be of stainless steel
1.5 Motor
Submersible, Explosion-proof 1.5 Hp. (1.12 kw), 1750 RPM ______ volt, 3 phase, 60 HZ, rated for continuous-in-air or submerged in sewage service. Power control cable of 25 ft (7.6 m) included. Class 1, Group C and D, Division 1 Hazardous locations. The motor shall feature:
- Frame - rugged cast iron ASTM type A-48, class 30
- Hardware - 316 stainless steel
- Stator Insulation - specially treated class "F" and "H" non-hydroscopic insulation with multiple dips and brakes. Phase insulation included for inverter duty
- Rotor - die cast aluminum, dynamically balanced. Exceeds NEMA limits per MGI - 12.06
- Shaft - high strength 416 stainless steel
- Bearings - specially adapted for vertical assembly. Both upper and lower bearings are pre-packed and sealed for life with special high temperature grease
- Cable Entry System - epoxy sealed butt spliced connect for non-wicking cable entry design
- Moisture System - two wire /two probe monitoring system constantly monitors oil chamber and stator housing for moisture
- Seals - tandem (dual) shaft steal system working independent of each other. Designed to withstand 100 PSI at all seal locations
1.6 Drive Arrangement
- a) the motor shall be close-coupled to a speed reducer drive, a heavy duty planetary gear of the totally enclosed non-vented type suitable for total submergence during emergencies
- b) double seals on the output shaft shall ensure flood-proof operation through a reduction ratio of 59:1
- c) the cycloidal reducer shall be capable of withstanding shock loads to 500% of its mechanical rating of 7.72 Hp. and be warranted for two (2) years
- d) the drive shall have a minimum full load efficiency of 90% and be pre-lubricated with grease, requiring routine maintenance every 500 to 1,000 hours
1.7 “Toilet Seat” Channel Mounting System
Shall consist of a box style structure fabricated of 304 Stainless Steel dimensioned to suit the existing channel and supported from above for ease of installation
